<template>
  <div>
    <!--    面包屑-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>

    <!--    卡片-->
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
        </el-col>
      </el-row>
      <!--表格-->
      <tree-table class="treeTable" :data="catelist" :columns="columns" :selection-type="false" :expand-type="false"
                  show-index
                  index-text="#" border>
        <!-- 是否有效 -->
        <template slot="isok" slot-scope="scope">
          <i class="el-icon-success" v-if="scope.row.cat_deleted===false" style="color: lightgreen;"></i>
          <i class="el-icon-error" v-else style="color: red;"></i>
        </template>
        <!-- 排序 -->
        <template slot="order" slot-scope="scope">
          <el-tag v-if="scope.row.cat_level===0" size="mini">一级</el-tag>
          <el-tag v-else-if="scope.row.cat_level===1" type="success" size="mini">二级</el-tag>
          <el-tag v-else type="warning" size="mini">三级</el-tag>
        </template>
        <!-- 操作 -->
        <template slot="opt" slot-scope="scope">
          <el-button type="primary" icon="el-icon-edit" size="mini">编辑</el-button>
          <el-button type="primary" icon="el-icon-delete" size="mini">删除</el-button>
        </template>
      </tree-table>

      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="querInfo.pagenum"
        :page-sizes="[1, 2, 5, 10]"
        :page-size="5"
        layout="total, sizes, prev, pager, next, jumper"
        :total="total">
      </el-pagination>
    </el-card>
    <!-- 添加分类的对话框 -->
    <!-- 添加分类的对话框 -->
    <el-dialog title="添加分类" :visible.sync="addCateDialogVisible" width="50%" @close="addCateDialogClosed">
      <!-- 添加分类的表单 -->
      <el-form :model="addCateForm" :rules="addCateFormRules" ref="addCateFormRef" label-width="100px">
        <el-form-item label="分类名称：" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类：">
          <!-- options 用来指定数据源 -->
          <!-- props 用来指定配置对象 -->
          <el-cascader expand-trigger="hover" :options="parentCateList" :props="cascaderProps" v-model="selectedKeys"
                       @change="parentCateChanged" clearable change-on-select>
          </el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
  export default {
    name: 'Cate',
    data() {
      return {
        // 选中的父级分类的Id数组
        selectedKeys: [],
        cascaderProps: {
          value: 'cat_id',
          label: 'cat_name',
          children: 'children'
        },
        parentCateList: [],
        addCateForm: {
          cat_name: '',
          cat_pid: 0,
          cat_level: 0
        },
        // 商品分类的数据列表，默认为空
        catelist: [],
        querInfo: {
          type: 3,
          pagenum: 1,
          pagesize: 5
        },
        addCateDialogVisible: false,
        total: 0,
        columns: [
          {
            label: '分类名称',
            prop: 'cat_name'
          },
          {
            label: '是否有效',
            type: 'template',
            template: 'isok'
          },
          {
            label: '排序',
            type: 'template',
            template: 'order'
          },
          {
            label: '操作',
            type: 'template',
            template: 'opt'
          }
        ],
        // 添加分类表单的验证规则对象
        addCateFormRules: {
          cat_name: [
            { required: true, message: '请输入分类名称', trigger: 'blur' }]
        }
      }
    },
    created() {
      this.getCateList()
    },
    methods: {
      addCateDialogClosed() {
        this.$refs.addCateFormRef.resetFields()
        this.selectedKeys=[]
        this.addCateForm.cat_pid = 0
        this.addCateForm.cat_level = 0
      },
      // 点击按钮，添加新的分类
      addCate() {
        this.$refs.addCateFormRef.validate(async valid => {
          if (!valid) return
          const { data: res } = await this.$http.post(
            'categories',
            this.addCateForm
          )
          if (res.meta.status !== 201) {
            return this.$message.error('添加分类失败！')
          }
          this.$message.success('添加分类成功！')
          this.getCateList()
          this.addCateDialogVisible = false
        })
      },

      parentCateChanged() {
        console.log(this.selectedKeys)
        if (this.selectedKeys.length > 0) {
          this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length - 1]
          this.addCateForm.cat_level = this.selectedKeys.length
          return
        } else {
          this.addCateForm.cat_pid = 0
          this.addCateForm.cat_level = 0
        }
      },
      // 获取父级分类的数据列表
      async getParentCateList() {
        const { data: res } = await this.$http.get('categories', {
          params: { type: 2 }
        })

        if (res.meta.status !== 200) {
          return this.$message.error('获取父级分类数据失败！')
        }

        console.log(res.data)
        this.parentCateList = res.data
      },
      // 点击按钮，展示添加分类的对话框
      showAddCateDialog() {
        // 先获取父级分类的数据列表
        this.getParentCateList()
        // 再展示出对话框
        this.addCateDialogVisible = true
      },

      // 监听 pagesize 改变
      handleSizeChange(newSize) {
        this.querInfo.pagesize = newSize
        this.getCateList()
      },
      // 监听 pagenum 改变
      handleCurrentChange(newPage) {
        this.querInfo.pagenum = newPage
        this.getCateList()
      },
      async getCateList() {
        const { data: res } = await this.$http.get('categories', { params: this.querInfo })
        if (res.meta.status !== 200) {
          return this.$message.error('获取商品分类失败！')
        }
        console.log(res.data)
        // 把数据列表，赋值给 catelist
        this.catelist = res.data.result
        this.total = res.data.total
      }
    }
  }
</script>

<style scoped>
  .treeTable {
    margin-top: 15px;
  }
</style>
